CN100595709C - Distributed process control system based on wireless personal area network and industrial ethernet network - Google Patents

Distributed process control system based on wireless personal area network and industrial ethernet network Download PDF

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CN100595709C
CN100595709C CN200810047182A CN200810047182A CN100595709C CN 100595709 C CN100595709 C CN 100595709C CN 200810047182 A CN200810047182 A CN 200810047182A CN 200810047182 A CN200810047182 A CN 200810047182A CN 100595709 C CN100595709 C CN 100595709C
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wireless
epa
message
grouping
functional block
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CN101261518A (en
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汪秉文
张炼冬
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

The invention provides a distributed process control system which is based on a wireless personal area network and an industrial Ethernet, comprising a plurality of local process control subsystems, an exchanger and a central monitoring computer, the local process control subsystems comprise a wireless field controller, a plurality of wireless sensors and a plurality of wireless actuators, the wireless sensors and the wireless actuators are positioned in a square area which takes the wireless field controller as a center, the wireless field controller is respectively connected with the wireless sensors and the wireless actuators by the wireless personal area network which contains two signal channels. The distributed process control system adopts the wireless personal area network to savethe cost of the cables and installation and adopts a parallel transmission method of the double wireless signal channels and a forecasting dispatch protocol which is based on the information priority,thus improving the real-time property of the communication. The invention further provides two planning methods of the signal channels of a passing mode and an overlapping mode, thus ensuring the different signal channel clusters which are used by the adjacent local process control subsystems and reducing the wireless interference in all the subsystems.

Description

Distributed process control system based on Wireless Personal Network and Industrial Ethernet
Technical field
The present invention relates to industrial process control technology field, a kind of distributed process control system based on Wireless Personal Network and Industrial Ethernet particularly is provided.
Background technology
In recent ten years, along with the quick progress of embedded microprocessor technology, embedded OS technology, computer networking technology and automatic measuring and controlling technology, the architectural framework of industries process control system little by little changes (field bus control system FCS can be included into network control system NCS) by the Distributed Control System (DCS) DCS of classics to network control system NCS.In present employed network control system NCS, field controller and respective sensor and actuator connect with data cable by fieldbus or Industrial Ethernet.Industrial Ethernet is compared with fieldbus, and data rate is faster, and easier and upper layer information network integration is considered to more potential.Current, there are 9 about the international standard of Industrial Ethernet, the EPA standard of China is one of them.
Because wireless network is in equipment connect up installation, operation maintenance and the aspect such as move freely and have suitable advantage, domestic and international in recent years many mechanisms and tissue are applied to the industrial measurement and control field with regard to radio network technique and have launched one and take turns the research and development competition.2004, initiate by USDOE, more than 70 tame major companies such as GE, Honeywell, RAE participate in having set up wireless industrial control network alliance (WINA), are devoted to solve the difficult point problem that wireless technology is used at industrial control field.2005, Europe comprise ERICSSON, UCL, LIPPERT 25 organized to set up a RUNES plan by name, wireless technology is used at Industry Control and automation development in following 10 years route map.2007, China has set up " wireless industrial technology and networked TT﹠C system research and development " main project specially in Eleventh Five-Year Plan 863 Program advanced manufacturing technology field, capture the technological difficulties of wireless technology in industrial measurement and control is used, to promote the foundation of " measure, control and use wireless communication technology " national standard system.
At present, the wireless communication technology standard/protocol that can be applicable to the industrial measurement and control field has: IEEE802.15.4 (the Wireless Personal Network international standard defines Physical layer and medium access control sublayer),
IEEE802.11a/b/g (the WLAN (wireless local area network) international standard defines Physical layer and medium access control sublayer)
IEEE1451.5 (the interoperability agreement between WLAN (wireless local area network), bluetooth and ZigBee);
SP100.11 (standard of low-power wireless sensor device-towards field control);
SP100.14 (standard of high bandwidth wireless infrastructure device and backbone network-towards monitoring);
ZigBee agreement (a kind of wireless sensor network standards of main flow);
WirelessHA (wireless HART protocol).
Industries process control system, as industrial measurement and control field one class special applications, it has proposed some higher requirements to the wireless internetworking between field controller and respective sensor and the actuator: the one, and very strong antijamming capability, various harmful effects such as can overcome when numerous sensor node, actuator device node and a spot of field controller nodes carries out radio communication in the network that outside noise, shadow fading, multipath disturb, disturb between node, the network middle-end is bundled into the probability that merit transmits to end data can reach 95%; The 2nd, harsh real-time communication, the loop response time to actuator is generally 10ms～500ms again from the sensor to the field controller, and for a certain concrete loop, should guarantee that the communication delay of this loop each several part reaches to provisioning request; The 3rd, very low energy consumption, the energy consumption that these peripherals of sensor and actuator are used for radio communication is very low, provides effective support to them with powered battery.Though the ZigBee technology satisfies the requirement of low-power consumption, and stronger antijamming capability is arranged, real-time communication can't guarantee.Though the IEEE802.11 wireless local area network technology satisfies the real-time communication requirement, very strong antijamming capability is also arranged, power consumption is very high.
Distributed nature according to the actual production process control system, the present invention is resolved into several local process control subsystem with whole Process Control System, each local process control subsystem comprises a field controller, field controller also has powerful Wireless Personal Network and Industrial Ethernet communication function except can making a strategic decision to the control performance of subsystem.Field controller establishes a communications link by all the sensors and the actuator in Wireless Personal Network and the affiliated local process control subsystem, establishes a communications link by Industrial Ethernet and other local process control subsystem.In the present invention, the Wireless Personal Network of all local process control subsystem, constituted a wireless cellular network system by channel multiplexing technology and power control techniques, in arbitrary Wireless Personal Network, field controller utilization advanced person's many antennas MIMO technology and multichannel access technology and sensor associated and actuator carry out radio communication efficiently.In the present invention, the field controller of all local process control subsystem realizes that by the information interaction between the Industrial Ethernet done subsystem overall situation of whole Process Control System is linked up.
Summary of the invention
The object of the present invention is to provide a kind of distributed process control system, improve real-time communication, reduce power consumption, reduced cost based on Wireless Personal Network and Industrial Ethernet.
The channel plan method that provides two kinds to be used for above-mentioned distributed process control system is provided, has reduced the air interference between each subsystem.
A kind of distributed process control system provided by the invention based on Wireless Personal Network and Industrial Ethernet, comprise a plurality of local process control subsystem, switch and center monitoring computing machine, each local process control subsystem connects switch by Industrial Ethernet, switch connects the center monitoring computing machine by Industrial Ethernet, described local process control subsystem comprises a wireless field controller, a plurality of wireless sensers and a plurality of wireless actuator, it is the square area at center that wireless senser and wireless actuator are positioned at wireless field controller, wireless field controller one end connects switch by Industrial Ethernet, and an other end connects wireless senser and wireless actuator by the Wireless Personal Network that comprises two channels.
It is the EPA standard that described Industrial Ethernet meets the ethernet standard that is used for factory automation, and described Wireless Personal Network meets Wireless Personal Network IEEE802.15.4 standard.
Two wireless channels of described Wireless Personal Network all periodically produce beacon frame, and the beacon frame of two channels goes out to differ now 8 time slots first.
Described wireless field controller and described wireless actuator or wireless senser adopt following channel time slot allocation scheme to carry out transmission of messages: wireless field controller with might be divided into four grades according to importance from the message of wireless senser or wireless actuator, and this message grade disposed to each wireless senser and wireless actuator, wireless field controller is five time slot sections with non-beacon frame dividing time-steps in the superframe, each time slot section transmits the message of assigned direction and given level, and the positional information of each time slot section is provided by the beacon frame in the superframe; Wireless field controller, wireless senser or wireless actuator select corresponding time slot section to carry out the message transmission according to the grade and the direction of self message to be sent; Wireless field controller according to the periodicity grade message of each wireless senser and wireless actuator in superframe theoretical occurrence number and one section observation time in the actual occurrence number of these message, dynamically adjust the timeslot number that each time slot section comprises in the superframe.
Technique effect of the present invention is embodied in the following aspects:
1. in distributed process control system based on Wireless Personal Network and Industrial Ethernet, field controller is connected by Wireless Personal Network with wireless senser and wireless actuator, the wiring of needing in the general distributed process control system having avoided connects, save cable cost and installation cost, widened application.
2. wireless senser or actuator can be to move into other Microcell in affiliated Microcell than low rate, initiatively insert new Microcell, this moment, the local control subsystem of former Microcell was obtained the observing and controlling state of this wireless senser or actuator by long-range trustship request mode to new Microcell, and the present invention is that general wired distributing Process Control System does not have to wireless senser and the ambulant support of actuator.
3. the employed wireless transmit/receive units of wireless senser or actuator meets the IEEE802.15.4 standard, this class wireless transmit/receive units belongs to short distance low-power consumption chip, under the powered battery situation, at least can work three months, after having adopted suitable dormancy mechanism, even can for 3 years, have good electricity saving performance.
4. adopt two wireless channel parallel transmission methods and, improved real-time communication based on the prediction scheduling protocol of message priority.A time slot is taken as (1*60*4b)/(250kbps)=0.96ms; The super frame period of single wireless channel is 16 time slots, and wherein the 1st time slot is that beacon frame takies, and the hypothesis beacon interval equals super frame period; If the super frame period of two wireless channels is 16 time slots, wherein the 1st time slot is that beacon frame takies, the beacon frame of supposing a channel falls behind 8 time slots than another second channel on sequential, beacon interval all equals super frame period, and two channels all allow to distribute to sensor and actuator; The control behavior that single wireless channel will just can be finished through 6 superframes (being 6*16*0.96ms=92.16ms) originally, and two wireless channel just can be finished through superframe more than 3 (being 3*16*0.96ms+8*0.96ms=53.76ms) afterwards.Each field controller is limited in 250kbps*2=500kbps to the field level data traffic of related sensor and actuator, can transmit in real time fast between the controller at the scene by Industrial Ethernet.
5. in the local process control subsystem, wireless senser and wireless actuator use improvedly believes that the counter-rotating power control method controls its emissive power, has overcome near-far interference and the multiple access interference the sub-district in well.
6. by using the wireless channel communication technology to make network capacity double, specifically, in a Microcell, each wireless channel can insert 15 of sensor or actuator nodes at most in a superframe, node by 50% inserts probability, and total access is counted and is [15/50%]+[15/50%]+1=61; In a standard cell cluster, based on aforementioned calculation, total access is counted and is 61*8=488; In two standard cell clusters, based on aforementioned calculation, total access is counted and is 488*2=976.
The channel plan method that is used for above-mentioned distributed process control system based on Wireless Personal Network and Industrial Ethernet provided by the invention is specially:
Step C1: whole area to be monitored is divided into several square small blocks, again each small block is divided into 9 Microcells according to the 3*3 mode;
Step C2: suppose that each small block middle Microcell is empty Microcell, to other Microcell from top to bottom from left to right successively predistribution channel set G (1), G (2) ..., G (8);
Step C3:, keep its preallocated channel set, otherwise regain its preallocated channel set if certain local process control subsystem that Microcell is distributed in the formula Process Control System covers; If certain local process control subsystem that empty Microcell is distributed in the formula Process Control System covers, the channel set of any one withdrawal is distributed to the sky Microcell;
Step C4: adjust channel set in each small block, the multiplex distance of cochannel Microcell is maximum as far as possible in the feasible adjacent two small blocks arbitrarily.
The present invention also provides the another kind of channel plan method that is used for above-mentioned distributed process control system based on Wireless Personal Network and Industrial Ethernet, is specially:
Step D1: the area to be monitored is divided into several square small blocks, again each is divided into 4 sub-pieces of square with small block by the 2*2 mode, be followed successively by sub-piece X from top to down from left to right 1, X 2, X 3And X 4, at last each sub-piece is divided into 4 Microcells by the 2*2 mode;
Step D2: at sub-piece X 1In, from top to bottom from left to right to 4 Microcells allocated channel collection G successively (1), G (2), G (3) and G (4); At block of cells X 3In, from top to bottom from left to right to 4 Microcells allocated channel collection G successively (5), G (6), G (7), G (8); Sub-piece X 4Channel set distribute and sub-piece X 1Identical, sub-piece X 2Channel set distribute and sub-piece X 3Identical.
Two kinds of channel plan methods provided by the invention guarantee that the employed channel set of adjacent local process control subsystem is inequality, have reduced the air interference between each subsystem significantly.
Description of drawings
Fig. 1 is a system global structure synoptic diagram of the present invention;
Fig. 2 is the structural representation of local process control subsystem of the present invention;
Fig. 3 is that the hardware of the wireless field controller of the present invention is formed block scheme;
Fig. 4 is the CPU (central processing unit) structural representation of the wireless field controller of the present invention;
Fig. 5 is two wireless channel superframe time slot allocation synoptic diagram of the wireless field controller of the present invention;
Fig. 6 is the emissive power control flow chart of wireless senser of the present invention/wireless actuator;
Fig. 7 is a kind of channel multiplexing mode of the present invention synoptic diagram;
Fig. 8 is the another kind of channel multiplexing mode of a present invention synoptic diagram.
Embodiment
The implication of some frames, message and the grouping that the present invention relates to is as follows:
Beacon frame: a kind of mac frame that is IEEE802.15.4 medium access control sublayer normalized definition.In the present invention, wireless field controller in the local process control subsystem, wireless senser and wireless actuator carry out time synchronized with beacon frame, have carried the transmission power level of wireless field controller and the time slot position information of each son section of superframe in this beacon frame simultaneously.
Command frame: a kind of mac frame that is IEEE802.15.4 medium access control sublayer normalized definition.In the present invention, wireless field controller in the same Wireless Personal Network, wireless senser and wireless actuator are supported connection request order, connection response order, are disconnected connection notification command, data request command, also support adaptive power thresholding loading command, emissive power adjustment order in addition especially, send message grade configuration order, channel switch request order, the order of channel handover acknowledge.(above-mentioned adaptive power thresholding loading command comprises the adaptive power upper limit and adaptive power lower limit two aspect information, and emissive power adjustment order comprises that the too high and emissive power of emissive power crosses low two kinds).
Frame: a kind of mac frame that is IEEE802.15.4 medium access control sublayer normalized definition.In the present invention, between wireless field controller and the wireless senser, between wireless field controller and the wireless actuator by data frames exchange and the irrelevant data message of Wireless Personal Network self.
Acknowledgement frame: a kind of mac frame that is IEEE802.15.4 medium access control sublayer normalized definition.Be used for replying to Frame and command frame.
Node observing and controlling status frames: the data in this frame are physical measurements values that certain wireless senser sends to wireless field controller, or certain wireless actuator sends to the execution result of wireless field controller.
Node execution command frame: the data in this frame are switching output orders that wireless field control sends to certain wireless actuator, or the running parameter that wireless field control sends to certain wireless senser is provided with instruction.
The meshed network maintenance frame: the data in this frame have following several: wireless field controller inserts setting to the Wireless Personal Network of certain wireless senser, wireless field controller inserts setting to the Wireless Personal Network of certain wireless actuator, wireless field controller is to the emissive power setting of self, the wireless channel frequency configuration of wireless field controller, wireless field controller is to the adaptive power threshold setting of certain wireless senser, wireless field controller is to the adaptive power threshold setting of certain wireless actuator, wireless field controller is to the emissive power adjustment instruction of certain wireless senser, wireless field controller is to the emissive power adjustment instruction of certain wireless actuator, wireless field controller is provided with the transmission message grade of certain wireless senser, wireless field controller is provided with the transmission message grade of certain wireless actuator, wireless field controller is to being provided with of each time slot of beacon frame section etc.(above-mentioned Wireless Personal Network inserts the access permission situation that has comprised on each wireless channel that is provided with).
The meshed network status frames: the data in this frame have following several: the electronic device description symbol of certain wireless senser, the electronic device description symbol of certain wireless actuator, the presence of certain wireless senser, the presence of certain wireless actuator, the power consumption state of wireless field controller self, the power consumption state of certain wireless senser, the power consumption state of certain wireless actuator, the average signal power of certain wireless senser that wireless field controller receives, the average signal power of certain wireless actuator that wireless field controller receives etc.
Individual territory net observing and controlling state message: every territory net observing and controlling state message comprises the effective information of all node observing and controlling status frames of certain control loop in the local process control subsystem.
Individual territory net execution command message: every territory net execution command message comprises the effective information of all node execution command frames of certain control loop in the local process control subsystem.
Individual territory net network configuration message: this message has following several: the channel frequency of a local wireless territory net is provided with instruction, the network coordinator address setting instruction of a local wireless territory net, a local wireless territory net predistribution wireless senser and wireless actuator address set announcement instruction, the networking instruction of a local wireless territory net, the net of removing of a local wireless territory net instructs, the dynamic interpolation wireless senser or the instruction of wireless actuator of a local wireless territory net, the dynamic deletion wireless senser or the instruction of wireless actuator of a local wireless territory net, the power parameter of a local wireless territory net all devices is provided with instruction, the message grade of a local wireless territory net all devices is provided with instruction etc.(an above-mentioned local wireless territory net all devices refers to wireless field controller, wireless senser and wireless actuator all of this Wireless Personal Network).
Individual territory net network state message: this message has following several: the electronic device description symbol tabulation of a local wireless territory net all devices, the presence tabulation of a local wireless territory net all devices, the power consumption state tabulation of a local wireless territory net all devices.
Long-range trustship request message: this message is used for triggering local local process control subsystem is returned local wireless territory several wireless senser of net certain or certain and wireless actuator immediately to other local process control subsystem observing and controlling status data.
Subsystem observing and controlling status packet: the effective information that comprises the individual territory net observing and controlling state message of all control loops in the local local process control subsystem.The a part of field process state that local local process control subsystem sends to the center monitoring computing machine has been carried in this grouping.
Subsystem execution command grouping: the effective information that comprises the individual territory net execution command message of all control loops in the local local process control subsystem.Another part field process state that local local process control subsystem sends to the center monitoring computing machine has been carried in this grouping.
Individual territory net network management grouping: the effective information that comprises one or more territory net network configuration message.The network parameter configuration-direct that the center monitoring computing machine sends to local local process control subsystem has been carried in this grouping.Individual territory net network state grouping: the effective information that comprises one or more territory net network state message.The network operation state that local local process control subsystem sends to the center monitoring computing machine has been carried in this grouping.
Long-range trustship request grouping: this grouping has two kinds: a kind of observing and controlling status data that is used for other local process control subsystem to the local process control subsystem request in this locality " among a local wireless territory net " certain or certain several wireless sensers and wireless actuator, another kind are used for the observing and controlling status data of other local process control subsystem to several wireless sensers of the local process control subsystem request in this locality " among will netting in a local wireless territory " certain or certain and wireless actuator.
Long-range trustship status packet: this grouping comprises certain or certain the several wireless sensers that local local process control subsystem returns to other local process control subsystem and the observing and controlling status data of wireless actuator.
Process task requests grouping: this grouping is used for the center monitoring computing machine or other local process control subsystem triggers immediately or stop immediately or condition triggers or condition stops one or multinomial control subfunction of local local process control subsystem.This grouping has comprised the process task call instruction that the center monitoring computing machine sends to local local process control subsystem, or other local process control subsystem sends to the subsystem cooperation instruction of local local process control subsystem.
Process task acknowledgment packet: this grouping is used for the result of local local process control subsystem to center monitoring computing machine or the execution of other local process control subsystem feedback procedure task requests.
EPA equipment control grouping: this grouping is by following several: be used to be provided with the request grouping of the IP address of this wireless field controller, the request that is used to read the EPA electronic device description symbol of this wireless existing controller is divided into groups, is used for setting up the link-attached request grouping of EPA etc. with the wireless field controller of other local process control subsystem.
EPA device acknowledge grouping: this grouping is by following several: IP address setting result packet, EPA electronic device description symbol read result packet, the EPA link connects result packet etc.
Fig. 1 is a system global structure synoptic diagram of the present invention, and distributed process control system comprises a plurality of local process control subsystem LPCS, switch and center monitoring computing machine.
All local process control subsystem LPCS and center monitoring computing machine all connect switch by Industrial Ethernet.The center monitoring computing machine is the reception terminal point of the operating state data of each local process control subsystem LPCS transmission, also is sending a little of steering order.Operating state data comprises field process state and network operation state two classes.The field process state comprises that wireless senser detected state, wireless actuator switch the running parameter of output, wireless senser, the execution result of wireless actuator etc., can be divided into observing and controlling state and execution command two classes, network operation state comprises the online tabulation of wireless senser, the online tabulation of wireless actuator, wireless senser power consumption state, wireless actuator power consumption state etc.Steering order comprises that process task call and network parameter dispose the instruction of two classes.Process task call instruction is generally at multinomial control subfunction, execution command is arranged immediately, command for stopping, conditional execution instruction, condition command for stopping are several immediately, the network parameter configuration-direct is specially the Wireless Personal Network channel frequency and instruction, the Wireless Personal Network network address are set are provided with that instruction, power parameter are provided with instruction, the message grade is provided with instruction etc.
Local process control subsystem LPCS is by the subsystem cooperation instruction of steering order and other local process control subsystem of switch receiving center supervisory control comuter, inner real-time detection and the control of finishing one's respective area production run state by Wireless Personal Network, be responsible for the operation maintenance of a local wireless territory net, and local operating state data fed back to the center monitoring computing machine in real time, some long-range trustship feedback of status are given other local process control subsystem, can receive the subsystem cooperation instruction that other local process control subsystem is sent in addition, carry out the TT﹠C task cooperation between system.Subsystem cooperation instruction between the above-mentioned local process control subsystem is general only at a control subfunction, execution command is arranged immediately, command for stopping, conditional execution instruction, condition command for stopping are several immediately, the execution priority of subsystem cooperation instruction is lower than process task call instruction.The above-mentioned long-range trustship state that feeds back to other local process control system refers to be subjected to the one or more wireless sensers of trustship and the state of wireless actuator, comprises execution result two classes of the measured value of wireless senser, wireless actuator.
Switch is the intermediate storage forwarding unit of operating state data, steering order, subsystem cooperation instruction and long-range trustship state, and provides power supply for each local process control subsystem LPCS.
Fig. 2 has provided the concrete composition situation of local process control subsystem LPCS, and local process control subsystem LPCS is made up of a wireless field controller C, several wireless senser S that are associated and wireless actuator A.On physical space, all wireless senser S and wireless actuator A in the local process control subsystem LPCS, the square area that to be arranged in wireless field controller C be the center (it may be the place in a building site or a factory building one jiao or a relatively independent cabin etc. in reality), this square area is called a Microcell.
In local process control subsystem LPCS, wireless field controller C is connected with wireless senser S and wireless actuator A by the double-channel Wireless Personal Network.In each Microcell, local wireless territory net uses the channel set G (p) that comprises two wireless channel G (p-s) and G (p-a), the possible value of p is 1,2 ..., 8).G (p-s) and G (p-a) are two in 16 physical channels of IEEE802.15.4 standard 2.4GHz ISM band regulation, and G (p-s) and G (p-a) are collectively referred to as channel set G (p).The carrier frequency of these 16 physical channels can be expressed as Fc (x)=2400+5xMHz (value of x is 1,2 ..., 16), for example the carrier frequency of G (1-s) and G (1-a) is respectively Fc (1) and Fc (5), and the carrier frequency of G (p-a) is than the high 20MHz of G (p-s).
The setting of channel set G (p) is carried out determining behind the general plan to whole distributed process control system by the user, and is distributed to each wireless field controller by the center monitoring computing machine by Industrial Ethernet.The employed channel set of adjacent local process control subsystem LPCS is inequality, and wireless field controller C uses two channel G (p-s) and the G (p-a) among the allocated channel collection G of institute (p) to communicate simultaneously.When wireless senser S nets in a local wireless territory at the first wireless field controller C of access place, successively channel G (1-s), G (2-s) ..., G (8-s) go up to send connection request, until being admitted by wireless field controller C at certain channel, if can not be admitted, again G (1-a), G (2-a) ..., G (8-a) go up to send connection request, until being admitted by wireless field controller C at certain channel, this channel is its virgin work channel.Wireless actuator A takes the mode identical with wireless senser to insert Wireless Personal Network.Wireless senser S and wireless actuator A are after inserting a local wireless territory net, and in order to compete relatively more nervous channel time slot or to avoid strong air interference, wireless senser S and wireless actuator A can switch between these two wireless channels.
The function of wireless field controller C is as follows:
(1) serves as Wireless Personal Network and Industrial Ethernet gateway.
For example: wireless field controller C need be all wireless sensers that obtain from a local wireless territory net and the field process state of wireless actuator, be converted to the grouping of subsystem observing and controlling status packet and subsystem execution command at first layer by layer, obtain the IP message through packing layer by layer then, send to the center monitoring computing machine by ethernet hardware at last.And for example: wireless field controller C need send to the center monitoring computing machine its IP message by ethernet hardware, unpack layer by layer earlier and obtain a territory net network management grouping, change the final meshed network maintenance frame that can be applicable to certain wireless senser or wireless actuator that generates then layer by layer.
(2) make up and a correct configuration local wireless territory net.
The network parameter configuration-direct that wireless field controller C sends according to the center monitoring computing machine, the working channel of a local wireless territory net, the network coordinator address of a local wireless territory net are set, write down the MAC Address collection of local Wireless Personal Network predistribution wireless senser, the MAC Address collection of a local wireless wireless actuator of territory net predistribution etc.Wireless field controller C is the Wireless Personal Network coordinator unit, it is behind the working channel collection G (p) that gets access to a local wireless territory net, on wireless channel G (p-s) and G (p-a), periodically send beacon frame continuously, for the transmitting-receiving of wireless senser S and wireless actuator A Frame and command frame provides synchronous clock (acknowledgement frame of wireless senser S or wireless actuator A generally follow wireless field controller C Frame/command frame return immediately).Wireless field controller C need be according to the network coordinator address of the MAC Address collection of a local wireless territory net predistribution wireless senser and wireless actuator and a local wireless territory net, finishes the network struction of wireless senser S and wireless actuator A in this Microcell.During the Wireless Personal Network device configuration, according to the message grade distribution instruction that the center monitoring computing machine sends, every messaging assignment messages grade of giving wireless senser S and wireless actuator A.During the Wireless Personal Network dynamic operation, may need to finish network insertion/dismounting of single wireless senser S or wireless actuator A.
(3) optimize the communication performance that net in a local wireless territory
Wireless field controller C need be according to the requirement to the grade of transmission of every related news of the control subfunction of local process control subsystem LPCS, channel access time slot to wireless senser S and wireless actuator A carries out rational management, improve the bandwidth availability ratio of channel, guarantee the prioritised transmission of high-grade real-time messages.In addition, the battery power consumption of real time monitoring wireless sensor S and wireless actuator A and the channel quality on every wireless links participate in wireless senser S and the wireless actuator A emissive power control when sending Frame and command frame.
(4) in time finish local measurement control task.
Wireless field controller C is according to the process task call instruction from the center monitoring computing machine, the subsystem cooperation instruction of other local process control subsystem, receive the observing and controlling state of the detected production run of wireless senser S by Wireless Personal Network, the structure execution command, and send wireless actuator A to.
(5) converge local scene process and network operation state.
Wireless field controller C need converge wireless senser S in the local process control subsystem LPCS and wireless actuator A to the network operation state of wireless senser S and wireless actuator A in the observing and controlling state of production run and execution command, the local wireless territory net, and then can pass to center monitoring computing machine and other local process control subsystem by Industrial Ethernet.
Wireless senser S is an intelligent wireless sensor, and it gathers the status data of in the production run certain/certain several check point, is that the Wireless Personal Network that works in beacon patterns is simplified function device.It supports initiatively to insert the Wireless Personal Network of place Microcell, can accept wireless field controller C it is sent the configuration of message grade, and adopt the prediction scheduling protocol based on message priority of the present invention to carry out the transmitting-receiving time control of message, can accept the loading of wireless field controller C, and adopt improved channel counter-rotating power control method provided by the invention to carry out emissive power control its adaptive power thresholding.It also supports initiatively to leave the Wireless Personal Network of place Microcell.
Wireless actuator A is the intelligent radio actuator, and it carries out the flow process switching command of in the production run certain/several Control point, is that the Wireless Personal Network that works in beacon patterns is simplified function device.It supports initiatively to insert the Wireless Personal Network of place Microcell, can accept wireless field controller C it is sent the configuration of message grade, and adopt the prediction scheduling protocol based on message priority of the present invention to carry out the transmitting-receiving time control of message, can accept the loading of wireless field controller C, and adopt improved channel counter-rotating power control method provided by the invention to carry out emissive power control its adaptive power thresholding.From the angle of Industry Control, wireless actuator need return execution result information to wireless field controller C; According to predetermined data transmission mode in the standard of IEEE802.15.4 medium access control sublayer, wireless actuator A should obtain wireless field controller C in the following manner will send to its Frame: at first, wireless field controller C issues the address of this wireless actuator A at the address field to be sent of beacon frame, this wireless actuator A sends the data request command frame to wireless field controller C afterwards, after field controller C replied, this is wireless, and actuator A waited for that receiving wireless field controller C sends to its Frame.It also supports initiatively to leave the Wireless Personal Network of place Microcell.
Wireless field controller C is a high performance general purpose controller, can support local control performance decision-making and other complex process to calculate effectively, it also should be a powerful communication controler simultaneously, can support two no channel wireless territory net and industrial real-time ethernet all sidedly.This has proposed higher requirement to its hardware formation, we have proposed a kind of hardware composition proposal based on the embedded microprocessor framework, as shown in Figure 3, it comprises: antenna 1, antenna 2, wireless transmit/receive units 3, wireless transmit/receive units 4, logic control element 5, CPU (central processing unit) 6, Ethernet medium access control module 7, Ethernet physics Transmit-Receive Unit 8, Ethernet isolating converter 9, network plug receptacle 10, power supply unit 11, clock unit more than 12 parts.Network plug receptacle 10 is the RJ-45 interface, meets the IEEE802.3af standard, and field controller C carries out exchanges data by this interface with switch, also obtains direct current supply from switch simultaneously.Power supply unit 11 converts the direct current supply voltage that obtains from network plug receptacle 10 to hardware system other parts desired multiple voltage gradation.Clock unit 12 is used for needing the other parts of reference clock that the work clock of multiple frequency is provided to hardware system.CPU (central processing unit) 6 is 32 embedded microprocessors, is used to move the software module storehouse of supporting Wireless Personal Network and EPA simultaneously.Ethernet medium access control module 7 is the 10/100M adaptive fast Ethernet media access controllers that meet IEEE802.3 medium access control sublayer standard.Logic control element 5 is a fpga chip, embedded two control assembly (representing with MAC-CtrlS and MAC-CtrlA that respectively they are corresponding with channel G (p-s) and G (p-a) respectively) and double-channel sequential logic control assemblies that meet IEEE802.15.4 medium access control sublayer standard; MAC-CtrlS in the logic control element 5 and MAC-CtrlA can control an IEEE 802.15.4 wireless transceiver transmitting-receiving IEEE 802.15.4MAC frame respectively, realize the time slot CSMA/CA Access Control of two channels simultaneously; Double-channel sequential logic control assembly in the logic control element 5 is responsible for producing periodic beacon frame on two channels, and makes the neighbor beacon frame of these two channels always differ 8 time slots in time.It between CPU (central processing unit) 6 and Ethernet medium access control module 7 and the logic control element 5 address date read-write bus interface.Ethernet physics Transmit-Receive Unit 8 is the 10/100M adaptive fast ethernet transceivers that meet IEEE 802.3 physical layer specifications, and the interface between it and the Ethernet medium access control module 7 is MII interface (the MII interface is the media stand-alone interface).Ethernet isolating converter 9 provides the electrical isolation protection for Ethernet physics Transmit-Receive Unit 8, between it and Ethernet physics Transmit-Receive Unit 8 and the network plug receptacle 10 with the digital differential electric level interface.Wireless transmit/receive units 3 and wireless transmit/receive units 4 are two 2.4GHz wireless transceivers that meet the IEEE802.15.4 physical layer specification, realize a physical layer data transmitting-receiving on the channel respectively, be SPI interface and digital level interface (the SPI interface is a Serial Peripheral Interface (SPI)) between they and the logic control element 5.Antenna 1 and antenna 2 respectively provide the air interface of data transmit-receive on the channel, and they respectively and be high frequency analog level interface between wireless transmit/receive units 3 and the wireless transmit/receive units 4.
Wireless field controller C, after the 10 acquisition direct current supplys of network plug receptacle, power supply unit 11 and clock unit 12 are at first started working, produce hardware system necessary voltage of other each several part work and clock, the bottom-up load operating successively of each functional block of the software module storehouse of CPU (central processing unit) 6 (the software module stack architecture of CPU (central processing unit) 6 is seen Fig. 4) afterwards, behind the Wireless Personal Network and the success of Industrial Ethernet parameter configuration of local process control subsystem, wireless field controller C just can carry out data transmit-receive by Wireless Personal Network and Industrial Ethernet, and running face is to the top-level functionality piece one wireless EPA functional block of concrete observing and controlling application.
Wireless field controller C receives the example of data by Industrial Ethernet: the bitstream stage data from center monitoring computing machine or other local process control subsystem arrive network plug receptacle 10 with digital differential level form; After the 9 voltage isolation conversion of Ethernet isolating converter, enter Ethernet physics Transmit-Receive Unit 8; 8 pairs of above-mentioned bitstream data of Ethernet physics Transmit-Receive Unit are carried out graceful Chester Manchester decoding, serial/parallel conversion, produce four bit parallel data stream and listen to carrier wave, receive data and effectively reach status signals such as receiving error detection, pass to Ethernet medium access control module 7; Ethernet medium access control module 7 is the data of unit with the byte with the data conversion that receives, after removing the ethernet mac frame head, if destination address byte section and this station address of received frame are complementary, just the load byte with received frame leaves in the send buffer, simultaneously the byte that receives is counted, and carry out CRC check, if the data that receive are error-free, just CPU (central processing unit) 6 sent to receive and interrupt; CPU (central processing unit) 6 (is carried out the driver of hardware interface by the ethernet device driver to Ethernet medium access control module 7, often it and Ethernet medium access control module 7 are seen and be integral), Frame in Ethernet medium access control module 7 send buffers is read, obtain up IP message, and be submitted to its EPA communication scheduling management function piece.
Wireless field controller C sends the example of data by Wireless Personal Network: the Wireless Personal Network data function piece of CPU (central processing unit) 6, (logic control element 5 is carried out the driver of hardware interface by double-channel Wireless Personal Network driver, often it and logic control element 5 are seen and are integral), the meshed network maintenance frame is write in the transmission buffer zone of a certain channel of logic control element 5 (being the transmission buffer zone of MAC-CtrlA or the transmission buffer zone of MAC-CtrlB); Logic control element 5 becomes the IEEE802.15.4MAC command frame with the data encapsulation that receives afterwards, sending time slots section at this command frame, if listen to be used to send present frame channel status for idle, just present frame is passed to wireless transmit/receive units 3 or wireless transmit/receive units 4; Wireless transmit/receive units 3 or wireless transmit/receive units 4 add IEEE802.15.4 Physical layer packet header (being made up of lead code territory, frame demarcation territory and frame length territory) with the frame that receives, then to data to be sent modulate, spread spectrum, power amplification, be transformed into high frequency analog signals, send in the air through antenna 1 or antenna 2 and go.
The structure of the software module storehouse of the CPU (central processing unit) 6 of wireless field controller C, as shown in Figure 4.
Wireless Personal Network data function piece 13 is used to receive node observing and controlling status frames and the meshed network status frames from described logic control element 5, node observing and controlling status frames converged obtain a territory net observing and controlling state message and send wireless EPA functional block 17 to, send the meshed network status frames to Wireless Personal Network management function piece 14; Reception obtains node execution command frame and sends logic control element 5 to the net execution command message decomposition of individual territory from the individual territory net execution command message of wireless EPA functional block 17; Reception is from the meshed network maintenance frame of Wireless Personal Network management function piece 14 and send described logic control element 5 to.
Wireless Personal Network management function piece 14 is used to receive the meshed network status frames from Wireless Personal Network data function piece 13, this frame is converged obtain a territory net network state message and send EPA administration agent functional block 15 to; Reception produces the meshed network maintenance frame according to a meshed network status frames and a territory net network configuration message, and sends Wireless Personal Network data function piece 13 to from the individual territory net network configuration message of EPA administration agent functional block 15.Four assemblies are arranged in Wireless Personal Network management function piece 14, and promptly device management component, access-in management assembly, power Control Component and Real-Time Scheduling assembly are with generating the meshed network maintenance frame.Wherein the function of device management component is that the working channel of local wireless territory net and the network coordinator address that net in a local wireless territory are set, the Wireless Personal Network coordinator function of startup/termination is wireless field controller C etc.Wherein the function of access-in management assembly is the access according to wireless senser S and wireless actuator A in the MAC Address collection admittance/refusal local microenvironment sub-district of a local wireless territory net predistribution wireless senser S and wireless actuator A, give the wireless senser S and the wireless actuator A distribution network address that allow access, the wireless senser S and the wireless actuator A deviated from network that have inserted in the pressure local wireless territory net, accept initiatively deviated from network of the wireless senser S that inserted in the net of local wireless territory and wireless actuator A, confiscate the wireless senser S that just left and the network address of wireless actuator A, be responsible for a local wireless territory and net interior wireless senser S and the equiblibrium mass distribution of wireless actuator A on two wireless channels, the channel of accepting a local wireless interior wireless senser S of territory net and wireless actuator A switches requirement etc.Wherein the function of power Control Component is the emissive power of control wireless field controller C self, according to received signal to noise ratio area requirement to each wireless senser S and wireless actuator A in the local wireless territory net, load corresponding adaptive power thresholding to them, to actual too big or too little wireless senser S of signal to noise ratio (S/N ratio) and the wireless actuator A of accepting in the local wireless territory net, send corresponding power adjustment commands etc.Wherein the function of Real-Time Scheduling assembly is every transmission message arrangement transmission of messages grade to each wireless senser S and wireless actuator A in the local wireless territory net, according to the prediction scheduling protocol based on message priority of the present invention, the transmitting-receiving of the message of control wireless senser S and wireless actuator A etc. in each superframe.
EPA administration agent functional block 15 is used to receive the individual territory net network state message from Wireless Personal Network management function piece 14, individual territory net network state message is converted to a territory net network state grouping, and sends EPA application access functional block 16 to; Reception is from the net network management grouping of individual territory and the long-range trustship request grouping of EPA application access functional block 16, respectively individual territory net network management grouping and long-range trustship request grouping are unpacked and are converted to a territory net network configuration message and long-range trustship request message, send individual territory net network configuration message to Wireless Personal Network management function piece 14, send long-range trustship request message to EPA agent data functional block 16.EPA administration agent functional block 15 is guardians of a local wireless territory net management information bank, when the network state of certain a few territories net equipment of preserving in the local wireless territory net management information bank changes, its initiatively structure territory net network state grouping, and send EPA application access functional block to; After it receives a territory net network management grouping, find that a local wireless territory net is managed the network configuration parameters of certain equipment of preserving in the information bank and current requirement does not meet, it can initiatively be constructed corresponding network configuration message and send Wireless Personal Network management function piece 14 to; After it receives long-range trustship request packet requests, if one or more wireless senser S in trust and wireless actuator A have existed or just entered a local wireless territory net, it sends respective remote trustship request message can initiatively for EPA agent data functional block 16.
EPA agent data functional block 16 is used to intercept from the individual territory net observing and controlling state message of Wireless Personal Network data function piece 13 and the individual territory net execution command message of wireless EPA functional block 17, reception is from the long-range trustship request message of EPA administration agent functional block 15, to individual territory net observing and controlling state message with a territory net execution command message is changed and packing obtains subsystem observing and controlling status packet and the grouping of subsystem execution command, from the grouping of subsystem observing and controlling status packet and subsystem execution command, extract and generate long-range trustship status packet, with subsystem observing and controlling status packet with the corresponding data of long-range trustship request message, grouping of subsystem execution command and long-range trustship status packet send EPA application access functional block 18 to.EPA agent data functional block 16 is the guardians in a local wireless net variable data storehouse, territory, it nets the field process state that extracts local wireless Wireless Personal Network equipment the execution command message from an individual territory net observing and controlling state message and a territory of intercepting, when the corresponding states in some field process states and the local wireless net variable data storehouse, territory is not inconsistent, its can real-time update local wireless net variable data storehouse, territory, and initiatively construct corresponding subsystem observing and controlling status packet and subsystem and execute instruction and divide into groups to send to EPA application access functional block 18; After receiving long-range trustship request message, it can be termly from a local wireless net variable data storehouse, territory, extract the field process state of respective wireless sensor S and wireless actuator A, and construct corresponding long-range trustship status packet and send EPA application access functional block 18 to.
Wireless EPA functional block 17 is used to receive from the process task requests grouping of EPA application access functional block 18 with from the individual territory net observing and controlling state message of Wireless Personal Network data function piece 13, generate a territory net execution command message, send individual territory net execution command message to Wireless Personal Network data function piece 13, process task acknowledgment packet according to the execution command message assigned operation implementation status before the individual territory net observing and controlling state message structure sign sends it to EPA application access functional block 18.Wireless EPA functional block 17 can be from the grouping of process task requests, extract from the process task call instruction of center monitoring computing machine with from the subsystem cooperation of other local process control system and instruct, with the control subfunction of certain sequencing startup/terminal surface to concrete observing and controlling application.
EPA application access functional block 18 is used to receive the process task acknowledgment packet from wireless EPA functional block 17, sends it to EPA system management function piece 19; Reception is from subsystem observing and controlling status packet, the grouping of subsystem execution command and the long-range trustship status packet of EPA agent data functional block 16, and, send these five kinds of groupings to EPA socket mapping function piece 20 from the individual territory net network state grouping of EPA administration agent functional block 15; Reception sends individual territory net network management grouping to EPA administration agent functional block 15 from the net network management grouping of individual territory and the long-range trustship request grouping of EPA socket mapping function piece 20, sends long-range trustship request grouping to wireless EPA functional block 17; Reception sends it to wireless EPA functional block 17 from the process task requests grouping of EPA system management function piece 19.EPA application access functional block 18 is followed the EPA standard, the variables access service is provided for EPA agent data functional block 16 and EPA administration agent functional block 15, the incident management service is provided for wireless EPA functional block 17.
EPA system management function piece 19 is used for sending the process task requests grouping from EPA socket mapping function piece 20 to EPA application access functional block 18, will send EPA socket mapping function piece 20 from the process task acknowledgment packet of EPA application access functional block 18 to; Reception is from the EPA equipment control grouping of EPA socket mapping function piece 20, therefrom extract the IP address that is used to be provided with this wireless field controller the request grouping, be used to read the EPA electronic device description symbol of this wireless existing controller the request grouping, be used for setting up the link-attached request grouping of EPA with the wireless field controller of other local process control subsystem, structure characterizes that IP address setting result, EPA electronic device description symbol read the result, the EPA link connects result's EPA device acknowledge grouping and sends EPA socket mapping function piece 20 to.EPA system management function piece 19 is followed the EPA standard, is in charge of the management of calling of wireless EPA functional block 17, and the EPA management information bank of real-time servicing this locality.
EPA socket mapping function piece 20 is used to receive process task acknowledgment packet and the EPA device acknowledge grouping from EPA system management function piece 19, subsystem observing and controlling status packet, the grouping of subsystem execution command, the grouping of individual territory net network state and long-range trustship status packet from EPA application access functional block 18 send these six kinds of groupings to UDP/TCP functional block 21; Reception is from the grouping of process task requests, EPA equipment control grouping, individual territory net network management grouping and the long-range trustship request grouping of UDP/TCP functional block 21, send grouping of process task requests and EPA equipment control grouping to EPA system management function piece 19, individual territory net network management grouping and long-range trustship request grouping send EPA application access functional block 18 to.EPA socket mapping function piece 20 is followed the EPA standard, realizes the interface between EPA real-time communication service (comprising the variables access service), EPA management service (comprising the incident management service) and the UDP/TCP functional block 21.
UDP/TCP functional block 21 is used to receive process task acknowledgment packet, EPA device acknowledge grouping, subsystem observing and controlling status packet, the grouping of subsystem execution command, the grouping of individual territory net network state and the long-range trustship status packet from EPA socket mapping function piece 20, these six kinds of groupings are packed obtains descending UDP/TCP message, and sends IP functional block 22 to; Reception is from the up UDP/TCP message of IP functional block 22, from up UDP/TCP message, unpack and obtain the grouping of process task requests, EPA equipment control grouping, individual territory net network management grouping and long-range trustship request grouping, and send EPA socket mapping function piece 20 to.UDP/TCP functional block 21 is used to realize UDP and two kinds of host-host protocols of TCP.
IP functional block 22 is used to receive the descending UDP/TCP message from UDP/TCP functional block 21, and descending UDP/TCP message is packed obtains downstream IP message, sends it to EPA communication scheduling management function piece 23; Reception is from the up IP message of EPA communication scheduling management function piece 23, up IP message unpacked obtain up UDP/TCP message, sends it to UDP/TCP functional block 21.IP functional block 22 is used to realize IP communication protocol.
EPA communication scheduling management function piece 23 is used for sending the downstream IP message from IP functional block 22 to described Ethernet medium access control module 7; To send IP functional block 22 to from the up IP message of Ethernet medium access control module 7.EPA communication scheduling management function piece 23 is followed the EPA standard, is used for dispatching and managing the transmission of Industrial Ethernet real-time Communication for Power IP message and non-realtime traffic IP message.
Fig. 5 is two wireless channel superframe time slot use figure of the wireless field controller C of local process control subsystem LPCS.To local process control subsystem LPCS, it is wireless field controller C and wireless senser S and wireless actuator A is when carrying out wireless data transceiving, except will being undertaken synchronously, also need reasonably to use wireless channel G (p-s) and G (p-a) to go up each time slot of superframe by beacon frame.In the present invention, whole superframe all is planned to movable part, and in the time slot of movable part except that the time slot that beacon frame takies, all incorporate competition into and insert period CAP.
In the present invention, with the transmission message between wireless field controller C and wireless senser S and the wireless actuator A, be divided into four grades by transmission real-time requirement height, promptly 1,2,3,4, the real-time of its middle grade 1 correspondence requires the highest, and the real-time of grade 2,3,4 correspondences requires to reduce successively.(here, the transmission of messages grade is corresponding one by one with transmission of messages priority, and grade of transmission is that 1 transmission of messages priority is the highest, and grade of transmission is that 4 transmission of messages priority is minimum).For a wireless senser S or wireless actuator A, may have the different observing and controlling message of many grade of transmission and (use message relevant but that have nothing to do with Wireless Personal Network self with radio fest and control, message on the other side is internet message in Wireless Personal Network), the present invention's agreement is as long as wireless senser S or wireless actuator A can carry the observing and controlling message of transmission lower grade in the time slot of the high-grade observing and controlling message of transmission, it is considered herein that in fact the observing and controlling message that has at first than the low transmission grade have higher grade of transmission, thereby when dividing observing and controlling message grade, should with the packet unit, small data quantity observing and controlling message is merged in the suitable packet of grade as far as possible and go, to make full use of wireless senser S or the transmittability of wireless actuator A in a time slot.The observing and controlling message grade of wireless senser S of the present invention or wireless actuator A is based on packet.Observing and controlling message between wireless field controller C and wireless senser S and wireless actuator A can be divided into four classes: wireless senser S mails to the observing and controlling message of wireless field controller C, wireless field controller C and mails to the observing and controlling message of wireless actuator A, wireless field controller C and mail to the observing and controlling message that wireless senser S observing and controlling message (generally as the running parameter setting) and wireless actuator A mail to wireless field controller C (generally be used for returning execution result).Because wireless field controller C mails to the observing and controlling message of wireless senser S and observing and controlling message that wireless actuator A mails to wireless field controller C is generally least commonly used, not too important for the fast and stable control of system performance, these two kinds of observing and controlling message also are classified as class 4.The observing and controlling message and the wireless field controller C that mail to wireless field controller C at wireless senser S mail in the observing and controlling message of wireless actuator A, periodically observing and controlling message and aperiodicity observing and controlling message are arranged, it is considered herein that the periodically priority height of the priority ratio aperiodicity observing and controlling message of observing and controlling message, the grade of transmission service rating 1,2,3 of periodicity observing and controlling message, and the grade of transmission service rating 4 of aperiodicity observing and controlling message.As long as connecting, sets up on the network between wireless field controller C and wireless senser S and the wireless actuator A, and important link does not interrupt basically, it is considered herein that transmit on the Wireless Personal Network about general networking message, be the very low message of transfer level, its grade is equivalent to class 4; And with the corresponding internet message of power adjustment commands, transfer level should be higher, but the probability of this transmission of messages is generally lower, temporarily the grade of this message is used as class 4 and treats.
The present invention's agreement, after the territory net of the local wireless between wireless field controller C and wireless senser S and the wireless actuator A makes up, be that unit is divided into 5 son sections: M0, M1, M2, M3, M4 with the time slot with the part of removing in each superframe on the channel G (p-s) of wireless field controller C outside the beacon frame; Be that unit is divided into 5 son sections: N0, N1, N2, N3, N4 with the time slot equally, also with the part of removing in each superframe on the channel G (p-a) outside the beacon frame; Wherein M0 section and N0 section are exclusively used in the observing and controlling message that the wireless field controller C of transmission sends to wireless actuator A and wireless senser S, M1 section and N1 section is exclusively used in that to transmit grade that wireless senser S sends to wireless field controller C be 1 observing and controlling message, M2 section and N2 section are used to transmit wireless senser S and send to the grade of wireless field controller C in the observing and controlling message more than 2, M3 section and N3 section are used to transmit grade that wireless senser S sends to wireless field controller C in the observing and controlling message more than 3, and M4 section and N4 section is used to transmit wireless senser S and sends to the grade of wireless field controller C in the observing and controlling message more than 4, the internet message that wireless actuator A sends to the observing and controlling message of wireless field controller C and is used to safeguard a local wireless territory net; Wherein M2 and N2 often are called the permission transmission section of grade 2 message again, and the permission that M3 and N3 often are called grade 3 message again sends sub section, and the permission that M4 and N4 often are called class 4 message again sends the son section.Fig. 7 has provided the son section planning situation of time slot in channel G (p-s) and last continuous two superframes of G (p-a).
Prediction scheduling protocol agreement based on above-mentioned message priority is an interactive protocol, relate to wireless field controller C and wireless senser S and wireless actuator A simultaneously, wherein wireless field controller C is the leader of message scheduling, the subordinate of wireless senser S and wireless actuator A message scheduling.Specify with channel G (p-s) below:
1). wireless field controller C issues wireless senser S and wireless actuator A on this channel in the beacon frame of each superframe of channel G (p-s) message to this superframe in the operating position of each non-beacon frame time slot.Provide address number and specific address that wireless field controller C will send the Target Wireless actuator A and the Target Wireless sensor S of observing and controlling message in the subdomain of the address to be sent of beacon frame, address number is corresponding to the timeslot number of M0 section.Net load subdomain at beacon frame represents respectively that with 44 bit cells wireless senser S sends to the timeslot number of the grade 1 observing and controlling message-specific of wireless field controller C, wireless senser S sends to the common timeslot number that uses of grade 2 above observing and controlling message of wireless field controller C, wireless senser S sends to the common timeslot number that uses of grade 3 above observing and controlling message of wireless field controller C, wireless senser S sends to the above observing and controlling message of class 4 of wireless field controller C, the common timeslot numbers that use such as internet message that wireless actuator A sends to the observing and controlling message of wireless field controller C and is used to safeguard a local wireless territory net, their value is corresponding M1 respectively, M2, M3, the timeslot number of M4 section.According to the timeslot number of M1, M2, M3, M4 section, also just known their initial time slot position information.
2). insert the wireless actuator A of a local wireless territory net by channel G (p-s), catch beacon frame and with beacon frame synchronously after, from the beacon frame of current superframe, obtain the time slot position information of M0 section and M4 section.If the address of this wireless actuator A is arranged in the address to be sent subdomain of the beacon frame of current superframe, then in M0 of the current superframe of channel G (p-s) section, send the data request command frame to wireless field controller C, after wireless field controller C replys, wait for receiving the observing and controlling message that wireless field controller C sends to it; Actuator A has observing and controlling message or internet message to issue wireless field controller C if this is wireless, then sends corresponding message in M4 of the current superframe of channel G (p-s) section to wireless field controller C; If wireless field controller C has the network information to issue this wireless actuator A, then directly send corresponding message to this wireless actuator A in M4 of the current superframe of channel G (p-s) section.
3). insert the wireless senser S of a local wireless territory net by channel G (p-s), catch beacon frame and with beacon frame synchronously after, from the beacon frame of current superframe, obtain M0, M1, M2, M3 and M4 section time slot position information.If the address of this wireless senser S is arranged in the address to be sent subdomain of the beacon frame of current superframe, then in M0 of the current superframe of channel G (p-s) section, send the data request command frame to wireless field controller C, after wireless field controller C replys, wait for receiving the observing and controlling message that wireless field controller C sends to it; If this wireless senser S has the observing and controlling message of grade 1 to issue wireless field controller C, then it sends corresponding message in M1 of the current superframe of channel G (p-s) section to wireless field controller C; If this wireless senser S has the observing and controlling message of grade 2 to issue wireless field controller C, then it sends corresponding message in M2 of the current superframe of channel G (p-s) section to wireless field controller C; If this wireless senser S has the observing and controlling message of grade 3 to issue wireless field controller C, then it sends corresponding message in M3 of the current superframe of channel G (p-s) section to wireless field controller C; If this wireless senser S has the observing and controlling message of class 4 or the network information to issue wireless field controller C, then it sends corresponding message in M4 of the current superframe of channel G (p-s) section to wireless field controller C; When if the high-grade observing and controlling message of this wireless senser S is issued wireless field controller C at the current superframe of channel G (p-s), failure occurs sending, it can allow to send the son section in the inferior grade message in the current superframe of channel G (p-s) and continue to send this high-grade observing and controlling message to wireless field controller C; If this wireless senser S has the network information to issue wireless field controller C, then directly send corresponding message to wireless field controller C in M4 of the current superframe of channel G (p-s) section; If wireless field controller C has the network information to issue this wireless senser S, then directly send corresponding message to this wireless senser S in M4 of the current superframe of channel G (p-s) section.
4). wireless field controller C goes up the theoretical occurrence number of each grade periodicity observing and controlling message in channel G (p-s) superframe of wireless senser S and wireless actuator A according to channel G (p-s), with the number of times of the actual appearance of these message in one section observation time, dynamically adjust channel M0, M1, M2, M3, M4 section at G (p-s) timeslot number in the superframe subsequently.
Fig. 6 is the emissive power control flow chart of local process control subsystem LPCS wireless senser S/ actuator A.In local process control subsystem LPCS, the IEEE802.15.4MAC frame that wireless senser S/ actuator A sends has three kinds of Frame, command frame and acknowledgement frames, wherein acknowledgement frame brief and important (this be because: send Frame, command frame and acknowledgement frame with same emissive power, the little energy that acknowledgement frame consumes, and acknowledgement frame is once lose, certainly will cause the repeating transmission of Frame/command frame, cause bigger energy consumption).In improved channel counter-rotating power control method of the present invention, the IEEE802.15.4MAC frame power of supposing wireless field controller C emission is enough strong, wireless senser S/ actuator A in the local microenvironment sub-district is received, suppose that simultaneously wireless senser S/ actuator A always sends with maximum transmission power acknowledgement frame, only controls the emissive power of Frame/command frame.Wireless senser S/ actuator A at the emissive power control flow of the Frame/command frame of a super frame period as shown in the figure.Concrete steps are as follows:
Step T1: it is 0 that setting data frame/command frame sends number of success Cr, and it is 0 that Frame/command frame sends frequency of failure Cw, and it is 0 that power is adjusted sign Fa continuously, power unusual fluctuation factor delta=0.5;
Step T2: catch the beacon frame that wireless field controller sends, detect the useful signal power P r of this beacon frame, extract the emissive power Pm of wireless field controller;
Step T3: calculate emissive power Pt=Pm+Pd+ δ (Pu-Pd)-Pr, Pu and Pd are respectively adaptive threshold power bound Pu and Pd, and δ is the power unusual fluctuation factor;
Step T4:, enter step T5, otherwise enter step T20 if in current superframe, have Frame or command frame to send;
Step T5: change emissive power Pt into the nominal emissive power, and send Frame or command frame to wireless field controller with this nominal power;
Step T6: the acknowledgement frame as if receiving from wireless field controller enters step T7, otherwise enters step T17;
Step T7:, enter step T8, otherwise enter step T11 if receive the power adjustment commands of wireless field controller;
Step T8: if power adjustment commands for reducing power, enters step T9, power adjustment commands enters step T10 for increasing power;
Step T9: put power and adjust sign Fa=1 continuously, power unusual fluctuation factor delta reduces one-level, enters step T15;
Step T10: put power and adjust sign Fa=1 continuously, power unusual fluctuation factor delta improves one-level, enters step T15;
Step T11: readout power is adjusted sign Fa continuously, judges that whether Fa is 0, changes step T16 if not;
Step T12: Frame/command frame sends number of success Cr=Cr+1;
Step T13:, enter step T14, otherwise change step T4 over to if Frame/command frame sends number of success Cr=10;
Step T14: power unusual fluctuation factor delta reduces one-level;
Step T15: upgrade emissive power Pt=Pm+Pd+ δ (Pu-Pd)-Pr, change step T4 over to;
Step T16: put power and adjust sign Fa=0 continuously, Frame/command frame sends number of success Cr=0, changes step T4 over to;
Step T17: Frame/command frame sends frequency of failure Cw=Cw+1;
Step T18: if Frame/command frame sends frequency of failure Cw=2, enter step T19, otherwise if change step T5 over to;
Step T19: Frame/command frame sends number of success Cr=0, and power unusual fluctuation factor delta improves one-level, upgrades emissive power Pt=Pm+Pd+ δ (Pu-Pd)-Pr, changes step T5 over to;
Step T20: the transmission of command frame or Frame in the current superframe that terminates.
Actual distributed process control system in that physical space is concrete when disposing numerous sensors and actuator, tends to occur some big white spaces, should carry out channel set with the block of cells of bye pattern this moment and distribute when multiplexing, and concrete steps are as follows:
Step S7-1: whole area to be monitored is divided into several square small blocks, again each small block is divided into 9 Microcells according to the 3*3 mode.For each small block, 9 Microcells are arranged, but have only 8 channel sets can supply to distribute, thereby must have a Microcell to distribute less than channel set, bye becomes an empty Microcell in a standard cell cluster.In each small block, suppose that the middle Microcell is empty Microcell, to the every from top to bottom generally row of other Microcell from left to right successively predistribution channel set G (1), G (2) ..., G (8).
Step S7-2: if Microcell is covered by certain local process control subsystem, keep its preallocated channel set, otherwise regain; If empty Microcell is covered by certain local process control subsystem, the channel set of any one withdrawal is distributed to the sky Microcell;
If the length of side of square Microcell is A, the span of the signal covering radius R of wireless field controller often is in each Microcell: 0.5A≤R≤0.707A.It is multiplexing that S7-1 and step S7-2 carry out the channel set distribution set by step, though can be so that the multiplex distance of most co-channel cells be 3A in adjacent two block of cells, in addition bigger, also may make the multiplex distance of some co-channel cells less, be 2.828A or 2.236A, even be 2A.
Step S7-3: proceed from the situation as a whole, concrete deployment according to the wireless cellular system of distributed process control system, take adequate measures, the multiplex distance of co-channel cells in any adjacent two block of cells (two square Microcell center between distance) is optimized, makes it maximum generally.These measures have: the channel set of adjacent Microcell channel set exchange, other recovery of retry etc.
After the channel allocation of each Microcell is finished, be handed down to wireless field controller C by Industrial Ethernet, and it is set to working channel by the channel parameter of Wireless Personal Network communication scheduling management entity function to be set by the center monitoring computing machine.
Fig. 7 has provided the concrete distribution multiplexed situation of channel set in the area of space that comprises 81 Microcells, this area of space is made up of 9 3*3 Microcells, each 3*3 Microcell is with adding black border separately, add up to 11 empty Microcells, wherein the centre of normal Microcell has marked corresponding local process control subsystem LPCS (LPCS among the figure (1)～LPCS (70)) and employed channel set G (p), and oblique line has been filled in the zone of empty Microcell.If according to step S7-1 and step S7-2, the channel set that LPCS (1) distributes was G (1) originally, the channel set that LPCS (4) distributes was G (2) originally, original and the LPCS (23) of LPCS (4) is a co-channel cells, and multiplex distance is 2A, but after the adjacent Microcell channel set exchange measure among the S7-3 that takes steps, the channel set that is about to LPCS (1) and LPCS (4) exchanges, as shown in FIG., current LPCS (4) and LPCS (26) are co-channel cells, and multiplex distance is 3A.If according to step S7-1 and step S7-2, the channel set that LPCS (20) distributes was G (3) originally, original and LPCS (33) of LPCS (20) and LPCS (41) are co-channel cells, multiplex distance is respectively 2.828A and 2.236A, but the channel set of other recovery of retry among the S7-3 that takes steps, be that LPCS (20) uses channel set G (7), as shown in FIG., the multiplex distance of current LPCS (20) and other co-channel cells is all greater than 3A.
Some distributed process control systems when concrete numerous sensors of deployment of physical space and actuator, do not allow to reserve some big blank distributed areas.Whole distributed process control system is being divided into a plurality of local process control subsystem, when adopting square picocell deployment to comprise the wireless cellular system of wireless field controller, wireless senser and wireless actuator, accomplish that the total space covers, should carry out the spatial reuse of wireless channel collection this moment with the block of cells that adopts the overlapping pattern, and concrete steps are as follows:
Step S8-1: the area to be monitored is divided into several square small blocks, again each is divided into 4 sub-pieces of square with small block by the 2*2 mode, be followed successively by sub-piece X from top to down from left to right 1, X 2, X 3And X 4, at last each sub-piece is divided into 4 Microcells by the 2*2 mode;
Step S8-2: at sub-piece X 1In, from top to bottom from left to right to 4 Microcells allocated channel collection G successively (1), G (2), G (3) and G (4); At block of cells X 3In, from top to bottom from left to right to 4 Microcells allocated channel collection G successively (5), G (6), G (7), G (8); Sub-piece X 4Channel set distribute and sub-piece X 1Identical, sub-piece X 2Channel set distribute and sub-piece X 3Identical.
Fig. 8 has provided the concrete distribution multiplexed situation of channel set in the area of space that comprises 64 Microcells, this area of space is made up of 4 4*4 Microcells, each 4*4 Microcell is with adding black border separately), wherein the centre of each Microcell has marked corresponding local process control subsystem (LPCS among Fig. 8 (1)～(64))) and employed channel set G (p).
If the length of side of square Microcell is A, the span of the signal covering radius R of wireless field controller often is in each Microcell: 0.5A≤R≤0.707A.For co-channel cells in the block of cells or the co-channel cells between the block of cells, multiplex distance is 2.828A, even bigger.

Claims (9)

1, a kind of distributed process control system based on Wireless Personal Network and Industrial Ethernet, comprise a plurality of local process control subsystem, switch and center monitoring computing machine, each local process control subsystem connects switch by Industrial Ethernet, switch connects the center monitoring computing machine by Industrial Ethernet, it is characterized in that
Described local process control subsystem comprises a wireless field controller, a plurality of wireless senser and a plurality of wireless actuator, it is the square area at center that wireless senser and wireless actuator are positioned at wireless field controller, wireless field controller one end connects switch by Industrial Ethernet, and an other end connects wireless senser and wireless actuator by the Wireless Personal Network that comprises two channels.
2, the distributed process control system based on Wireless Personal Network and Industrial Ethernet according to claim 1, it is characterized in that, it is the EPA standard that described Industrial Ethernet meets the ethernet standard that is used for factory automation, and described Wireless Personal Network meets Wireless Personal Network IEEE802.15.4 standard.
3, the distributed process control system based on Wireless Personal Network and Industrial Ethernet according to claim 2, it is characterized in that, two wireless channels of described Wireless Personal Network all periodically produce beacon frame, and the neighbor beacon frame of two channels goes out always to differ now 8 time slots.
4, the distributed process control system based on Wireless Personal Network and Industrial Ethernet according to claim 1 and 2, it is characterized in that described wireless field controller and described wireless actuator or wireless senser adopt following channel time slot allocation scheme to carry out transmission of messages:
Wireless field controller with might be divided into four grades according to importance from the message of wireless senser or wireless actuator, and this message grade disposed to each wireless senser and wireless actuator, wireless field controller is five time slot sections with non-beacon frame dividing time-steps in the superframe, each time slot section transmits the message of assigned direction and given level, and the positional information of each time slot section is provided by the beacon frame in the superframe;
Wireless field controller, wireless senser or wireless actuator select corresponding time slot section to carry out the message transmission according to the grade and the direction of self message to be sent;
Wireless field controller according to the periodicity grade message of each wireless senser and wireless actuator in superframe theoretical occurrence number and one section observation time in the actual occurrence number of these message, dynamically adjust the timeslot number that each time slot section comprises in the superframe.
5, the distributed process control system based on Wireless Personal Network and Industrial Ethernet according to claim 1 and 2 is characterized in that, described wireless senser/wireless actuator is determined emissive power in accordance with the following methods:
Step T1: it is 0 that setting data frame/command frame sends number of success Cr, and it is 0 that Frame/command frame sends frequency of failure Cw, and it is 0 that power is adjusted sign Fa continuously;
Step T2: catch the beacon frame that wireless field controller sends, detect the useful signal power P r of this beacon frame, extract the emissive power Pm of wireless field controller;
Step T3: calculate emissive power Pt=Pm+Pd+ δ (Pu-Pd)-Pr, Pu and Pd are respectively the adaptive power upper limit and adaptive power lower limit, and δ is the power unusual fluctuation factor;
Step T4:, enter step T5, otherwise enter step T20 if in current superframe, have Frame or command frame to send;
Step T5: change emissive power Pt into the nominal emissive power, and send Frame or command frame to wireless field controller with this nominal power;
Step T6: the acknowledgement frame as if receiving from wireless field controller enters step T7, otherwise enters step T17;
Step T7:, enter step T8, otherwise enter step T11 if receive the power adjustment commands of wireless field controller;
Step T8: if power adjustment commands for reducing power, enters step T9, power adjustment commands enters step T10 for increasing power;
Step T9: power is adjusted sign Fa=1 continuously, and power unusual fluctuation factor delta reduces one-level, enters step T15;
Step T10: power is adjusted sign Fa=1 continuously, and power unusual fluctuation factor delta improves one-level, enters step T15;
Step T11: readout power is adjusted sign Fa continuously, judges that whether Fa is 0, changes step T16 if not;
Step T12: Frame/command frame sends number of success Cr=Cr+1;
Step T13:, enter step T14, otherwise change step T4 over to if Frame/command frame sends number of success Cr=10;
Step T14: power unusual fluctuation factor delta reduces one-level;
Step T15: upgrade emissive power Pt=Pm+Pd+ δ (Pu-Pd)-Pr, change step T4 over to;
Step T16: put power and adjust sign Fa=0 continuously, Frame/command frame sends number of success Cr=0, changes step T4 over to;
Step T17: Frame/command frame sends frequency of failure Cw=Cw+1;
Step T18: if Frame/command frame sends frequency of failure Cw=2, enter step T19, otherwise if change step T5 over to:
Step T19: Frame/command frame sends number of success Cr=0, and power unusual fluctuation factor delta improves one-level, upgrades emissive power Pt=Pm+Pd+ δ (Pu-Pd)-Pr, changes step T5 over to;
Step T20: the transmission of command frame or Frame in the current superframe that terminates.
6, distributed process control system based on Wireless Personal Network and Industrial Ethernet according to claim 1 and 2, it is characterized in that, described wireless field controller comprises: the power supply unit (11) that links to each other with each consumer, network plug receptacle (10) one ends connect described switch, the other end is successively by Ethernet isolating converter (9), Ethernet physics Transmit-Receive Unit (8), Ethernet medium access control module (7) connects an end of CPU (central processing unit) (6), the other end of CPU (central processing unit) (6) connects wireless transmit/receive units (3) and wireless transmit/receive units (4) respectively by logic control element (5), wireless transmit/receive units (3) connects first antenna (1), wireless transmit/receive units (4) connects second antenna (2), logic control element (5), wireless transmit/receive units (3) and wireless transmit/receive units (4) also join with clock unit (12) respectively.
7, the distributed process control system based on Wireless Personal Network and Industrial Ethernet according to claim 6 is characterized in that, described CPU (central processing unit) (6) comprising:
Wireless Personal Network data function piece (13) is used for receiving node observing and controlling status frames and the meshed network status frames from described logic control element (5), node observing and controlling status frames converged obtain a territory net observing and controlling state message and send wireless EPA functional block (17) to, simultaneously the meshed network status frames is sent to Wireless Personal Network management function piece (14); Reception obtains the net execution command message decomposition of individual territory node execution command frame and sends logic control element (5) to from the individual territory net execution command message of wireless EPA functional block (17); Reception is from the meshed network maintenance frame of Wireless Personal Network management function piece (14) and send described logic control element (5) to;
Wireless Personal Network management function piece (14) is used for receiving the meshed network status frames from Wireless Personal Network data function piece (13), this frame is converged obtain a territory net network state message and send EPA administration agent functional block (15) to; Reception produces the meshed network maintenance frame according to a meshed network status frames and a territory net network configuration message, and sends Wireless Personal Network data function piece (13) to from the individual territory net network configuration message of EPA administration agent functional block (15);
EPA administration agent functional block (15) is used for receiving the individual territory net network state message from Wireless Personal Network management function piece (14), individual territory net network state message is converted to a territory net network state grouping, and sends EPA application access functional block (16) to; Reception is from the net network management grouping of individual territory and the long-range trustship request grouping of EPA application access functional block (16), respectively individual territory net network management grouping and long-range trustship request grouping are unpacked and are converted to a territory net network configuration message and long-range trustship request message, send individual territory net network configuration message to Wireless Personal Network management function piece (14), send long-range trustship request message to EPA agent data functional block (16);
EPA agent data functional block (16) is used for intercepting from the individual territory net observing and controlling state message of Wireless Personal Network data function piece (13) and the individual territory net execution command message of wireless EPA functional block (17), reception is from the long-range trustship request message of EPA administration agent functional block (15), to individual territory net observing and controlling state message with a territory net execution command message is changed and packing obtains subsystem observing and controlling status packet and the grouping of subsystem execution command, from the grouping of subsystem observing and controlling status packet and subsystem execution command, extract and generate long-range trustship status packet, with subsystem observing and controlling status packet with the corresponding data of long-range trustship request message, grouping of subsystem execution command and long-range trustship status packet send EPA application access functional block (18) to;
Wireless EPA functional block (17) is used for receiving from the process task requests grouping of EPA application access functional block (18) with from the individual territory net observing and controlling state message of Wireless Personal Network data function piece (13), generate a territory net execution command message, send individual territory net execution command message to Wireless Personal Network data function piece (13), process task acknowledgment packet according to the execution command message assigned operation implementation status before the individual territory net observing and controlling state message structure sign sends it to EPA application access functional block (18);
EPA application access functional block (18) is used for receiving the process task acknowledgment packet from wireless EPA functional block (17), sends it to EPA system management function piece (19); Reception is from subsystem observing and controlling status packet, the grouping of subsystem execution command and the long-range trustship status packet of EPA agent data functional block (16), and, send these five kinds of groupings to EPA socket mapping function piece (20) from the individual territory net network state grouping of EPA administration agent functional block (15); Reception is from the net network management grouping of individual territory and the long-range trustship request grouping of EPA socket mapping function piece (20), send individual territory net network management grouping to EPA administration agent functional block (15), send long-range trustship request grouping to wireless EPA functional block (17); Reception sends it to wireless EPA functional block (17) from the process task requests grouping of EPA system management function piece (19);
EPA system management function piece (19) is used for sending the process task requests grouping from EPA socket mapping function piece (20) to EPA application access functional block (18), will send EPA socket mapping function piece (20) to from the process task acknowledgment packet of EPA application access functional block (18); Reception is from the EPA equipment control grouping of EPA socket mapping function piece (20), therefrom extract the IP address that is used to be provided with this wireless field controller the request grouping, be used to read the EPA electronic device description symbol of this wireless existing controller the request grouping, be used for setting up the link-attached request grouping of EPA with the wireless field controller of other local process control subsystem, structure characterizes that IP address setting result, EPA electronic device description symbol read the result, the EPA link connects result's EPA device acknowledge grouping and sends EPA socket mapping function piece (20) to;
EPA socket mapping function piece (20) is used for receiving process task acknowledgment packet and the EPA device acknowledge grouping from EPA system management function piece (19), subsystem observing and controlling status packet, the grouping of subsystem execution command, the grouping of individual territory net network state and long-range trustship status packet from EPA application access functional block (18) send these six kinds of groupings to UDP/TCP functional block (21); Reception is from the grouping of process task requests, EPA equipment control grouping, individual territory net network management grouping and the long-range trustship request grouping of UDP/TCP functional block (21), send grouping of process task requests and EPA equipment control grouping to EPA system management function piece (19), individual territory net network management grouping and long-range trustship request grouping send EPA application access functional block (18) to;
UDP/TCP functional block (21) is used for receiving process task acknowledgment packet, EPA device acknowledge grouping, subsystem observing and controlling status packet, the grouping of subsystem execution command, the grouping of individual territory net network state and the long-range trustship status packet from EPA socket mapping function piece (20), these six kinds of groupings are packed obtains descending UDP/TCP message, and sends IP functional block (22) to; Reception is from the up UDP/TCP message of IP functional block (22), from up UDP/TCP message, unpack and obtain the grouping of process task requests, EPA equipment control grouping, individual territory net network management grouping and long-range trustship request grouping, and send EPA socket mapping function piece (20) to;
IP functional block (22) is used for receiving the descending UDP/TCP message from UDP/TCP functional block (21), and descending UDP/TCP message is packed obtains downstream IP message, sends it to EPA communication scheduling management function piece (23); Reception is from the up IP message of EPA communication scheduling management function piece (23), up IP message unpacked obtain up UDP/TCP message, sends it to UDP/TCP functional block (21);
EPA communication scheduling management function piece (23) is used for sending the downstream IP message from IP functional block (22) to described Ethernet medium access control module (7); To send IP functional block (22) to from the up IP message of Ethernet medium access control module (7).
8, a kind of channel plan method that is used for the described distributed process control system based on Wireless Personal Network and Industrial Ethernet of claim 1 is specially:
Step C1: whole area to be monitored is divided into several square small blocks, again each small block is divided into 9 Microcells according to the 3*3 mode;
Step C2: suppose that each small block middle Microcell is empty Microcell, to other Microcell from top to bottom from left to right successively predistribution channel set G (1), G (2) ..., G (8);
Step C3:, keep its preallocated channel set, otherwise regain its preallocated channel set if certain local process control subsystem that Microcell is distributed in the formula Process Control System covers; If certain local process control subsystem that empty Microcell is distributed in the formula Process Control System covers, the channel set of any one withdrawal is distributed to the sky Microcell;
Step C4: adjust channel set in each small block, the multiplex distance of cochannel Microcell is maximum as far as possible in the feasible adjacent two small blocks arbitrarily.
9. channel plan method that is used for the described distributed process control system based on Wireless Personal Network and Industrial Ethernet of right 1 is specially:
Step D1: the area to be monitored is divided into several square small blocks, again each is divided into 4 sub-pieces of square with small block by the 2*2 mode, be followed successively by sub-piece X from top to down from left to right 1, X 2, X 3And X 4, at last each sub-piece is divided into 4 Microcells by the 2*2 mode;
Step D2: at sub-piece X 1In, from top to bottom from left to right to 4 Microcells allocated channel collection G successively (1), G (2), G (3) and G (4); At block of cells X 3In, from top to bottom from left to right to 4 Microcells allocated channel collection G successively (5), G (6), G (7), G (8); Sub-piece X 4Channel set distribute and sub-piece X 1Identical, sub-piece X 2Channel set distribute and sub-piece X 3Identical.
CN200810047182A 2008-03-28 2008-03-28 Distributed process control system based on wireless personal area network and industrial ethernet network Expired - Fee Related CN100595709C (en)

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